Most of the time when you buy an older movie companies do not want to go through and put six channels of audio. It is way easier and cheaper just to record it, stamp dolby digital on it and send it out. you have to be sure when you buy something like this it says "5.1". dolby digital is a company not a sound effect. so many things are dolby digital, but not in surround sound. good dvd though, I own it.